<!DOCTYPE HTML>
<html>
<head>
    <title>My WebSocket</title>
</head>

<body>
Welcome<br/>
<input id="text" type="text"/>
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body>

<script type="text/javascript">
    var websocket = null;
    var websocketArr = [];

    //判断当前浏览器是否支持WebSocket,主要此处要更换为自己的地址
    if ('WebSocket' in window) {
        websocket = new WebSocket("ws://localhost:9000/wsdemo");
        console.log(websocket)
        // for (let i = 0; i < 256; i++) {
        //     websocket = new WebSocket("ws://localhost:9000/wsdemo");
        //     if (websocket) {
        //         websocketArr.push(websocket);
        //     }
        // }
    } else {
        alert('Not support websocket')
    }

    //连接发生错误的回调方法
    websocket.onerror = function () {
        setMessageInnerHTML("error");
    };

    //连接成功建立的回调方法
    websocket.onopen = function (event) {
        setMessageInnerHTML("open");
    }

    //接收到消息的回调方法
    websocket.onmessage = function (event) {
        setMessageInnerHTML(event.data);
    }

    //连接关闭的回调方法
    websocket.onclose = function () {
        setMessageInnerHTML("close");
    }

    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function () {
        websocket.close();
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket() {
        websocket.close();
        // websocketArr.forEach(item=>{
        //     websocket.close();
        // })
        // for (let i = 0; i < 10; i++) {
        //     websocketArr[i].close();
        // }
    }

    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>
</html>